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format.go
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format.go
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/*
* Copyright (c) 2017, The Easegress Authors
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package v
import (
"encoding/base64"
"fmt"
"net"
"net/http"
"net/url"
"regexp"
"time"
)
var (
formatsFuncs = map[string]FormatFunc{
"urlname": urlName,
"httpmethod": httpMethod,
"httpmethod-array": httpMethodArray,
"httpcode": httpCode,
"httpcode-array": httpCodeArray,
"timerfc3339": timerfc3339,
"duration": duration,
"ipcidr": ipcidr,
"ipcidr-array": ipcidrArray,
"hostport": hostport,
"regexp": _regexp,
"base64": _base64,
"url": _url,
}
urlCharsRegexp = regexp.MustCompile(`^[\p{L}0-9\-_\.~]{1,253}$`)
)
func getFormatFunc(format string) (FormatFunc, bool) {
switch format {
case "date-time", "email", "hostname", "ipv4", "ipv6", "uri":
return standardFormat, true
case "":
// NOTICE: Empty format does nothing like standard format.
return standardFormat, true
}
if fn, exists := formatsFuncs[format]; exists {
return fn, true
}
return nil, false
}
func standardFormat(v interface{}) error {
// NOTICE: Its errors will be reported by standard json schema.
return nil
}
func urlName(v interface{}) error {
if urlCharsRegexp.MatchString(v.(string)) {
return nil
}
return fmt.Errorf("invalid name format: %s", v)
}
func httpMethod(v interface{}) error {
switch v.(string) {
case http.MethodGet,
http.MethodHead,
http.MethodPost,
http.MethodPut,
http.MethodPatch,
http.MethodDelete,
http.MethodConnect,
http.MethodOptions,
http.MethodTrace:
return nil
default:
return fmt.Errorf("invalid http method")
}
}
func httpMethodArray(v interface{}) error {
for _, method := range v.([]string) {
err := httpMethod(method)
if err != nil {
return err
}
}
return nil
}
func httpCode(v interface{}) error {
code := v.(int)
// Reference: https://tools.ietf.org/html/rfc7231#section-6
if code < 100 || code >= 600 {
return fmt.Errorf("invalid http code")
}
return nil
}
func httpCodeArray(v interface{}) error {
for _, method := range v.([]int) {
err := httpCode(method)
if err != nil {
return err
}
}
return nil
}
func timerfc3339(v interface{}) error {
s := v.(string)
_, err := time.Parse(time.RFC3339, s)
if err != nil {
return fmt.Errorf("invalid RFC3339 time: %v", err)
}
return nil
}
func duration(v interface{}) error {
s := v.(string)
_, err := time.ParseDuration(s)
if err != nil {
return fmt.Errorf("invalid duration: %v", err)
}
return nil
}
func ipcidr(v interface{}) error {
s := v.(string)
ip := net.ParseIP(s)
if ip != nil {
return nil
}
_, _, err := net.ParseCIDR(s)
if err != nil {
return fmt.Errorf("invalid ip or cidr")
}
return nil
}
func ipcidrArray(v interface{}) error {
for _, ic := range v.([]string) {
err := ipcidr(ic)
if err != nil {
return err
}
}
return nil
}
func hostport(v interface{}) error {
s := v.(string)
_, _, err := net.SplitHostPort(s)
if err != nil {
return fmt.Errorf("invalid hostport: %v", err)
}
return nil
}
func _regexp(v interface{}) error {
s := v.(string)
_, err := regexp.Compile(s)
if err != nil {
return fmt.Errorf("invalid regular expression: %v", err)
}
return nil
}
func _base64(v interface{}) error {
s := v.(string)
_, err := base64.StdEncoding.DecodeString(s)
if err != nil {
return fmt.Errorf("invalid base64: %v", err)
}
return nil
}
func _url(v interface{}) error {
s := v.(string)
_, err := url.Parse(s)
if err != nil {
return fmt.Errorf("invalid url: %v", err)
}
return nil
}